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Arrays are implemented so that only the defined elements use memory; they are "sparse arrays". Setting myArray [10] = 'someThing' and myArray [57] = 'somethingOther' only uses space for these two elements, just like any other object. The length of the array will still be reported as 58.
In computer programming, foreach loop (or for-each loop) is a control flow statement for traversing items in a collection. foreach is usually used in place of a standard for loop statement.
Augmented assignment (or compound assignment) is the name given to certain assignment operators in certain programming languages (especially those derived from C).An augmented assignment is generally used to replace a statement where an operator takes a variable as one of its arguments and then assigns the result back to the same variable.
Folds can be regarded as consistently replacing the structural components of a data structure with functions and values. Lists, for example, are built up in many functional languages from two primitives: any list is either an empty list, commonly called nil ([]), or is constructed by prefixing an element in front of another list, creating what is called a cons node ( Cons(X1,Cons(X2,Cons ...
Find variable reference (placeholder), replace it by its variable value. This algorithm offers no cache strategy. Split and join string: splitting the string into an array, merging it with the corresponding array of values, then joining items by concatenation. The split string can be cached for reuse.
There is a single check on termination if the sentinel value has been hit, which replaces a test for each iteration. It is also possible to temporarily replace the last element of the array by a sentinel and handle it, especially if it is reached:
In case the result is a single-element array, it outputs that single element. Similar to JavaScript, PowerShell allows the final semicolon to be left off. Example as an expression evaluator:
case input when Array then puts 'input is an Array!' when Hash then puts 'input is a Hash!' end Ruby also returns a value that can be assigned to a variable, and doesn’t actually require the case to have any parameters (acting a bit like an else if statement):